Abstract: Strain based Approach to the Modeling of Concrete under Uniaxial Tension-Tension Fatigue Loading is briefly described regarding Stiffness degradation and inelastic deformation which are the essential features of concrete that develop due to the formation of multitude of microcracks in the fatigue environment. Microcracking, which is anisotropic in nature, destroys the bond between material grains, and affects the elastic properties resulting in the reduction of material stiffness. This paper presents Strain based Approach to the Modeling of Concrete under Uniaxial Tension-Tension Fatigue Loading. The model is developed, in strain space, using the general framework of internal variable theory of continuum thermodynamics. It is argued that within the damage surface of given strain states the unloading-reloading cycles (fatigue loading) stimulate the nucleation and growth microcracks in concrete, which will result in stiffness degradation and inelastic deformation, and hence material is termed as damaged. Damage is reflected through the fourth-order stiffness tensor involving a damage parameter whose increment is governed by the consistency equation associated with a cycle dependent damage surface in strain space. The model is capable of predicting stiffness degradation, inelastic deformation and strength reduction under fatigue loading and compared against experimental results.
Keywords: Fatigue; uniaxial; damage; Concrete; Thermodynamics; stiffness; microcracks, response tensors.
Title: Strain Based Approach to the Modeling of Concrete under Uniaxial Tension-Tension Fatigue Loading
Author: Indra Narayan Yadav, Dr. Kamal Bahadur Thapa
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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